blob: 2fd440d8d6b8d9b2b469c2aaec757bca05a9ac58 [file] [log] [blame]
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -07001/*
2 * inode.c - NILFS inode operations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 *
22 */
23
24#include <linux/buffer_head.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/gfp.h>
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070026#include <linux/mpage.h>
27#include <linux/writeback.h>
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -070028#include <linux/uio.h>
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070029#include "nilfs.h"
Al Viro6fd1e5c2010-06-07 11:55:00 -040030#include "btnode.h"
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070031#include "segment.h"
32#include "page.h"
33#include "mdt.h"
34#include "cpfile.h"
35#include "ifile.h"
36
Ryusuke Konishi0e14a352010-08-20 21:20:29 +090037struct nilfs_iget_args {
38 u64 ino;
39 __u64 cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +090040 struct nilfs_root *root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +090041 int for_gc;
42};
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070043
44/**
45 * nilfs_get_block() - get a file block on the filesystem (callback function)
46 * @inode - inode struct of the target file
47 * @blkoff - file block number
48 * @bh_result - buffer head to be mapped on
49 * @create - indicate whether allocating the block or not when it has not
50 * been allocated yet.
51 *
52 * This function does not issue actual read request of the specified data
53 * block. It is done by VFS.
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070054 */
55int nilfs_get_block(struct inode *inode, sector_t blkoff,
56 struct buffer_head *bh_result, int create)
57{
58 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090059 __u64 blknum = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070060 int err = 0, ret;
Ryusuke Konishi365e2152010-12-27 00:07:30 +090061 struct inode *dat = NILFS_I_NILFS(inode)->ns_dat;
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090062 unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070063
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090064 down_read(&NILFS_MDT(dat)->mi_sem);
65 ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
66 up_read(&NILFS_MDT(dat)->mi_sem);
67 if (ret >= 0) { /* found */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070068 map_bh(bh_result, inode->i_sb, blknum);
Ryusuke Konishic3a7abf2009-05-25 02:47:14 +090069 if (ret > 0)
70 bh_result->b_size = (ret << inode->i_blkbits);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070071 goto out;
72 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070073 /* data block was not found */
74 if (ret == -ENOENT && create) {
75 struct nilfs_transaction_info ti;
76
77 bh_result->b_blocknr = 0;
78 err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
79 if (unlikely(err))
80 goto out;
81 err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
82 (unsigned long)bh_result);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070083 if (unlikely(err != 0)) {
84 if (err == -EEXIST) {
85 /*
86 * The get_block() function could be called
87 * from multiple callers for an inode.
88 * However, the page having this block must
89 * be locked in this case.
90 */
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -070091 printk(KERN_WARNING
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070092 "nilfs_get_block: a race condition "
93 "while inserting a data block. "
94 "(inode number=%lu, file block "
95 "offset=%llu)\n",
96 inode->i_ino,
97 (unsigned long long)blkoff);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -070098 err = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -070099 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700100 nilfs_transaction_abort(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700101 goto out;
102 }
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900103 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700104 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700105 /* Error handling should be detailed */
106 set_buffer_new(bh_result);
Ryusuke Konishi27e6c7a2010-12-26 16:28:28 +0900107 set_buffer_delay(bh_result);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700108 map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
109 to proper value */
110 } else if (ret == -ENOENT) {
111 /* not found is not error (e.g. hole); must return without
112 the mapped state flag. */
113 ;
114 } else {
115 err = ret;
116 }
117
118 out:
119 return err;
120}
121
122/**
123 * nilfs_readpage() - implement readpage() method of nilfs_aops {}
124 * address_space_operations.
125 * @file - file struct of the file to be read
126 * @page - the page to be read
127 */
128static int nilfs_readpage(struct file *file, struct page *page)
129{
130 return mpage_readpage(page, nilfs_get_block);
131}
132
133/**
134 * nilfs_readpages() - implement readpages() method of nilfs_aops {}
135 * address_space_operations.
136 * @file - file struct of the file to be read
137 * @mapping - address_space struct used for reading multiple pages
138 * @pages - the pages to be read
139 * @nr_pages - number of pages to be read
140 */
141static int nilfs_readpages(struct file *file, struct address_space *mapping,
142 struct list_head *pages, unsigned nr_pages)
143{
144 return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
145}
146
147static int nilfs_writepages(struct address_space *mapping,
148 struct writeback_control *wbc)
149{
Ryusuke Konishif30bf3e2009-04-06 19:01:38 -0700150 struct inode *inode = mapping->host;
151 int err = 0;
152
153 if (wbc->sync_mode == WB_SYNC_ALL)
154 err = nilfs_construct_dsync_segment(inode->i_sb, inode,
155 wbc->range_start,
156 wbc->range_end);
157 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700158}
159
160static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
161{
162 struct inode *inode = page->mapping->host;
163 int err;
164
165 redirty_page_for_writepage(wbc, page);
166 unlock_page(page);
167
168 if (wbc->sync_mode == WB_SYNC_ALL) {
169 err = nilfs_construct_segment(inode->i_sb);
170 if (unlikely(err))
171 return err;
172 } else if (wbc->for_reclaim)
173 nilfs_flush_segment(inode->i_sb, inode->i_ino);
174
175 return 0;
176}
177
178static int nilfs_set_page_dirty(struct page *page)
179{
180 int ret = __set_page_dirty_buffers(page);
181
182 if (ret) {
183 struct inode *inode = page->mapping->host;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700184 unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
185
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900186 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700187 }
188 return ret;
189}
190
191static int nilfs_write_begin(struct file *file, struct address_space *mapping,
192 loff_t pos, unsigned len, unsigned flags,
193 struct page **pagep, void **fsdata)
194
195{
196 struct inode *inode = mapping->host;
197 int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
198
199 if (unlikely(err))
200 return err;
201
Christoph Hellwig155130a2010-06-04 11:29:58 +0200202 err = block_write_begin(mapping, pos, len, flags, pagep,
203 nilfs_get_block);
204 if (unlikely(err)) {
205 loff_t isize = mapping->host->i_size;
206 if (pos + len > isize)
207 vmtruncate(mapping->host, isize);
208
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700209 nilfs_transaction_abort(inode->i_sb);
Christoph Hellwig155130a2010-06-04 11:29:58 +0200210 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700211 return err;
212}
213
214static int nilfs_write_end(struct file *file, struct address_space *mapping,
215 loff_t pos, unsigned len, unsigned copied,
216 struct page *page, void *fsdata)
217{
218 struct inode *inode = mapping->host;
219 unsigned start = pos & (PAGE_CACHE_SIZE - 1);
220 unsigned nr_dirty;
221 int err;
222
223 nr_dirty = nilfs_page_count_clean_buffers(page, start,
224 start + copied);
225 copied = generic_write_end(file, mapping, pos, len, copied, page,
226 fsdata);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900227 nilfs_set_file_dirty(inode, nr_dirty);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700228 err = nilfs_transaction_commit(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700229 return err ? : copied;
230}
231
232static ssize_t
233nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
234 loff_t offset, unsigned long nr_segs)
235{
236 struct file *file = iocb->ki_filp;
237 struct inode *inode = file->f_mapping->host;
238 ssize_t size;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700239
240 if (rw == WRITE)
241 return 0;
242
243 /* Needs synchronization with the cleaner */
244 size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
245 offset, nr_segs, nilfs_get_block, NULL);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200246
247 /*
248 * In case of error extending write may have instantiated a few
249 * blocks outside i_size. Trim these off again.
250 */
251 if (unlikely((rw & WRITE) && size < 0)) {
252 loff_t isize = i_size_read(inode);
253 loff_t end = offset + iov_length(iov, nr_segs);
254
255 if (end > isize)
256 vmtruncate(inode, isize);
257 }
258
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700259 return size;
260}
261
Alexey Dobriyan7f094102009-09-21 17:01:10 -0700262const struct address_space_operations nilfs_aops = {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700263 .writepage = nilfs_writepage,
264 .readpage = nilfs_readpage,
Ryusuke Konishie85dc1d2009-05-27 07:27:12 +0900265 .sync_page = block_sync_page,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700266 .writepages = nilfs_writepages,
267 .set_page_dirty = nilfs_set_page_dirty,
268 .readpages = nilfs_readpages,
269 .write_begin = nilfs_write_begin,
270 .write_end = nilfs_write_end,
271 /* .releasepage = nilfs_releasepage, */
272 .invalidatepage = block_invalidatepage,
273 .direct_IO = nilfs_direct_IO,
Hisashi Hifumi258ef672009-05-13 11:19:40 +0900274 .is_partially_uptodate = block_is_partially_uptodate,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700275};
276
277struct inode *nilfs_new_inode(struct inode *dir, int mode)
278{
279 struct super_block *sb = dir->i_sb;
280 struct nilfs_sb_info *sbi = NILFS_SB(sb);
281 struct inode *inode;
282 struct nilfs_inode_info *ii;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900283 struct nilfs_root *root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700284 int err = -ENOMEM;
285 ino_t ino;
286
287 inode = new_inode(sb);
288 if (unlikely(!inode))
289 goto failed;
290
291 mapping_set_gfp_mask(inode->i_mapping,
292 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
293
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900294 root = NILFS_I(dir)->i_root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700295 ii = NILFS_I(inode);
296 ii->i_state = 1 << NILFS_I_NEW;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900297 ii->i_root = root;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700298
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900299 err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700300 if (unlikely(err))
301 goto failed_ifile_create_inode;
302 /* reference count of i_bh inherits from nilfs_mdt_read_block() */
303
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900304 atomic_inc(&root->inodes_count);
Dmitry Monakhov73459dc2010-03-04 17:32:15 +0300305 inode_init_owner(inode, dir, mode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700306 inode->i_ino = ino;
307 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
308
309 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
310 err = nilfs_bmap_read(ii->i_bmap, NULL);
311 if (err < 0)
312 goto failed_bmap;
313
314 set_bit(NILFS_I_BMAP, &ii->i_state);
315 /* No lock is needed; iget() ensures it. */
316 }
317
318 ii->i_flags = NILFS_I(dir)->i_flags;
319 if (S_ISLNK(mode))
320 ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL);
321 if (!S_ISDIR(mode))
322 ii->i_flags &= ~NILFS_DIRSYNC_FL;
323
324 /* ii->i_file_acl = 0; */
325 /* ii->i_dir_acl = 0; */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700326 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700327 nilfs_set_inode_flags(inode);
328 spin_lock(&sbi->s_next_gen_lock);
329 inode->i_generation = sbi->s_next_generation++;
330 spin_unlock(&sbi->s_next_gen_lock);
331 insert_inode_hash(inode);
332
333 err = nilfs_init_acl(inode, dir);
334 if (unlikely(err))
335 goto failed_acl; /* never occur. When supporting
336 nilfs_init_acl(), proper cancellation of
337 above jobs should be considered */
338
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700339 return inode;
340
341 failed_acl:
342 failed_bmap:
343 inode->i_nlink = 0;
344 iput(inode); /* raw_inode will be deleted through
345 generic_delete_inode() */
346 goto failed;
347
348 failed_ifile_create_inode:
349 make_bad_inode(inode);
350 iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
351 called */
352 failed:
353 return ERR_PTR(err);
354}
355
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700356void nilfs_set_inode_flags(struct inode *inode)
357{
358 unsigned int flags = NILFS_I(inode)->i_flags;
359
360 inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
361 S_DIRSYNC);
362 if (flags & NILFS_SYNC_FL)
363 inode->i_flags |= S_SYNC;
364 if (flags & NILFS_APPEND_FL)
365 inode->i_flags |= S_APPEND;
366 if (flags & NILFS_IMMUTABLE_FL)
367 inode->i_flags |= S_IMMUTABLE;
368#ifndef NILFS_ATIME_DISABLE
369 if (flags & NILFS_NOATIME_FL)
370#endif
371 inode->i_flags |= S_NOATIME;
372 if (flags & NILFS_DIRSYNC_FL)
373 inode->i_flags |= S_DIRSYNC;
374 mapping_set_gfp_mask(inode->i_mapping,
375 mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
376}
377
378int nilfs_read_inode_common(struct inode *inode,
379 struct nilfs_inode *raw_inode)
380{
381 struct nilfs_inode_info *ii = NILFS_I(inode);
382 int err;
383
384 inode->i_mode = le16_to_cpu(raw_inode->i_mode);
385 inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
386 inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
387 inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
388 inode->i_size = le64_to_cpu(raw_inode->i_size);
389 inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
390 inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
391 inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700392 inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
393 inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
394 inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
395 if (inode->i_nlink == 0 && inode->i_mode == 0)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700396 return -EINVAL; /* this inode is deleted */
397
398 inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
399 ii->i_flags = le32_to_cpu(raw_inode->i_flags);
400#if 0
401 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
402 ii->i_dir_acl = S_ISREG(inode->i_mode) ?
403 0 : le32_to_cpu(raw_inode->i_dir_acl);
404#endif
Ryusuke Konishi3cc811b2009-09-28 13:02:46 +0900405 ii->i_dir_start_lookup = 0;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700406 inode->i_generation = le32_to_cpu(raw_inode->i_generation);
407
408 if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
409 S_ISLNK(inode->i_mode)) {
410 err = nilfs_bmap_read(ii->i_bmap, raw_inode);
411 if (err < 0)
412 return err;
413 set_bit(NILFS_I_BMAP, &ii->i_state);
414 /* No lock is needed; iget() ensures it. */
415 }
416 return 0;
417}
418
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900419static int __nilfs_read_inode(struct super_block *sb,
420 struct nilfs_root *root, unsigned long ino,
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700421 struct inode *inode)
422{
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900423 struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700424 struct buffer_head *bh;
425 struct nilfs_inode *raw_inode;
426 int err;
427
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900428 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900429 err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700430 if (unlikely(err))
431 goto bad_inode;
432
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900433 raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700434
Ryusuke Konishi1b2f5a62009-08-22 19:10:07 +0900435 err = nilfs_read_inode_common(inode, raw_inode);
436 if (err)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700437 goto failed_unmap;
438
439 if (S_ISREG(inode->i_mode)) {
440 inode->i_op = &nilfs_file_inode_operations;
441 inode->i_fop = &nilfs_file_operations;
442 inode->i_mapping->a_ops = &nilfs_aops;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700443 } else if (S_ISDIR(inode->i_mode)) {
444 inode->i_op = &nilfs_dir_inode_operations;
445 inode->i_fop = &nilfs_dir_operations;
446 inode->i_mapping->a_ops = &nilfs_aops;
447 } else if (S_ISLNK(inode->i_mode)) {
448 inode->i_op = &nilfs_symlink_inode_operations;
449 inode->i_mapping->a_ops = &nilfs_aops;
450 } else {
451 inode->i_op = &nilfs_special_inode_operations;
452 init_special_inode(
453 inode, inode->i_mode,
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900454 huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700455 }
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900456 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700457 brelse(bh);
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900458 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700459 nilfs_set_inode_flags(inode);
460 return 0;
461
462 failed_unmap:
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900463 nilfs_ifile_unmap_inode(root->ifile, ino, bh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700464 brelse(bh);
465
466 bad_inode:
Ryusuke Konishi365e2152010-12-27 00:07:30 +0900467 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700468 return err;
469}
470
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900471static int nilfs_iget_test(struct inode *inode, void *opaque)
472{
473 struct nilfs_iget_args *args = opaque;
474 struct nilfs_inode_info *ii;
475
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900476 if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root)
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900477 return 0;
478
479 ii = NILFS_I(inode);
480 if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
481 return !args->for_gc;
482
483 return args->for_gc && args->cno == ii->i_cno;
484}
485
486static int nilfs_iget_set(struct inode *inode, void *opaque)
487{
488 struct nilfs_iget_args *args = opaque;
489
490 inode->i_ino = args->ino;
491 if (args->for_gc) {
492 NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE;
493 NILFS_I(inode)->i_cno = args->cno;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900494 NILFS_I(inode)->i_root = NULL;
495 } else {
496 if (args->root && args->ino == NILFS_ROOT_INO)
497 nilfs_get_root(args->root);
498 NILFS_I(inode)->i_root = args->root;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900499 }
500 return 0;
501}
502
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900503struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
504 unsigned long ino)
505{
506 struct nilfs_iget_args args = {
507 .ino = ino, .root = root, .cno = 0, .for_gc = 0
508 };
509
510 return ilookup5(sb, ino, nilfs_iget_test, &args);
511}
512
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900513struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
514 unsigned long ino)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700515{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900516 struct nilfs_iget_args args = {
517 .ino = ino, .root = root, .cno = 0, .for_gc = 0
518 };
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900519
520 return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
521}
522
523struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
524 unsigned long ino)
525{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700526 struct inode *inode;
527 int err;
528
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900529 inode = nilfs_iget_locked(sb, root, ino);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700530 if (unlikely(!inode))
531 return ERR_PTR(-ENOMEM);
532 if (!(inode->i_state & I_NEW))
533 return inode;
534
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900535 err = __nilfs_read_inode(sb, root, ino, inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700536 if (unlikely(err)) {
537 iget_failed(inode);
538 return ERR_PTR(err);
539 }
540 unlock_new_inode(inode);
541 return inode;
542}
543
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900544struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino,
545 __u64 cno)
546{
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900547 struct nilfs_iget_args args = {
548 .ino = ino, .root = NULL, .cno = cno, .for_gc = 1
549 };
Ryusuke Konishi263d90c2010-08-20 19:06:11 +0900550 struct inode *inode;
551 int err;
552
553 inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args);
554 if (unlikely(!inode))
555 return ERR_PTR(-ENOMEM);
556 if (!(inode->i_state & I_NEW))
557 return inode;
558
559 err = nilfs_init_gcinode(inode);
560 if (unlikely(err)) {
561 iget_failed(inode);
562 return ERR_PTR(err);
563 }
564 unlock_new_inode(inode);
565 return inode;
566}
567
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700568void nilfs_write_inode_common(struct inode *inode,
569 struct nilfs_inode *raw_inode, int has_bmap)
570{
571 struct nilfs_inode_info *ii = NILFS_I(inode);
572
573 raw_inode->i_mode = cpu_to_le16(inode->i_mode);
574 raw_inode->i_uid = cpu_to_le32(inode->i_uid);
575 raw_inode->i_gid = cpu_to_le32(inode->i_gid);
576 raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
577 raw_inode->i_size = cpu_to_le64(inode->i_size);
578 raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
579 raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
Ryusuke Konishi61239232009-04-06 19:02:00 -0700580 raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
581 raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700582 raw_inode->i_blocks = cpu_to_le64(inode->i_blocks);
583
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700584 raw_inode->i_flags = cpu_to_le32(ii->i_flags);
585 raw_inode->i_generation = cpu_to_le32(inode->i_generation);
586
587 if (has_bmap)
588 nilfs_bmap_write(ii->i_bmap, raw_inode);
589 else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
590 raw_inode->i_device_code =
Ryusuke Konishicdce2142010-05-09 15:31:22 +0900591 cpu_to_le64(huge_encode_dev(inode->i_rdev));
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700592 /* When extending inode, nilfs->ns_inode_size should be checked
593 for substitutions of appended fields */
594}
595
596void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh)
597{
598 ino_t ino = inode->i_ino;
599 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900600 struct inode *ifile = ii->i_root->ifile;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700601 struct nilfs_inode *raw_inode;
602
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900603 raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700604
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700605 if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state))
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900606 memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700607 set_bit(NILFS_I_INODE_DIRTY, &ii->i_state);
608
609 nilfs_write_inode_common(inode, raw_inode, 0);
610 /* XXX: call with has_bmap = 0 is a workaround to avoid
611 deadlock of bmap. This delays update of i_bmap to just
612 before writing */
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900613 nilfs_ifile_unmap_inode(ifile, ino, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700614}
615
616#define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */
617
618static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
619 unsigned long from)
620{
621 unsigned long b;
622 int ret;
623
624 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
625 return;
Ryusuke Konishie8289492010-11-19 15:26:20 +0900626repeat:
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700627 ret = nilfs_bmap_last_key(ii->i_bmap, &b);
628 if (ret == -ENOENT)
629 return;
630 else if (ret < 0)
631 goto failed;
632
633 if (b < from)
634 return;
635
636 b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
637 ret = nilfs_bmap_truncate(ii->i_bmap, b);
638 nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
639 if (!ret || (ret == -ENOMEM &&
640 nilfs_bmap_truncate(ii->i_bmap, b) == 0))
641 goto repeat;
642
Ryusuke Konishie8289492010-11-19 15:26:20 +0900643failed:
644 nilfs_warning(ii->vfs_inode.i_sb, __func__,
645 "failed to truncate bmap (ino=%lu, err=%d)",
646 ii->vfs_inode.i_ino, ret);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700647}
648
649void nilfs_truncate(struct inode *inode)
650{
651 unsigned long blkoff;
652 unsigned int blocksize;
653 struct nilfs_transaction_info ti;
654 struct super_block *sb = inode->i_sb;
655 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700656
657 if (!test_bit(NILFS_I_BMAP, &ii->i_state))
658 return;
659 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
660 return;
661
662 blocksize = sb->s_blocksize;
663 blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700664 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700665
666 block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
667
668 nilfs_truncate_bmap(ii, blkoff);
669
670 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
671 if (IS_SYNC(inode))
672 nilfs_set_transaction_flag(NILFS_TI_SYNC);
673
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900674 nilfs_mark_inode_dirty(inode);
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900675 nilfs_set_file_dirty(inode, 0);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700676 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700677 /* May construct a logical segment and may fail in sync mode.
678 But truncate has no return value. */
679}
680
Al Viro6fd1e5c2010-06-07 11:55:00 -0400681static void nilfs_clear_inode(struct inode *inode)
682{
683 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900684 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400685
686 /*
687 * Free resources allocated in nilfs_read_inode(), here.
688 */
689 BUG_ON(!list_empty(&ii->i_dirty));
690 brelse(ii->i_bh);
691 ii->i_bh = NULL;
692
Ryusuke Konishi518d1a62010-08-20 23:40:54 +0900693 if (mdi && mdi->mi_palloc_cache)
694 nilfs_palloc_destroy_cache(inode);
695
Al Viro6fd1e5c2010-06-07 11:55:00 -0400696 if (test_bit(NILFS_I_BMAP, &ii->i_state))
697 nilfs_bmap_clear(ii->i_bmap);
698
699 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900700
701 if (ii->i_root && inode->i_ino == NILFS_ROOT_INO)
702 nilfs_put_root(ii->i_root);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400703}
704
705void nilfs_evict_inode(struct inode *inode)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700706{
707 struct nilfs_transaction_info ti;
708 struct super_block *sb = inode->i_sb;
709 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700710
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900711 if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700712 if (inode->i_data.nrpages)
713 truncate_inode_pages(&inode->i_data, 0);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400714 end_writeback(inode);
715 nilfs_clear_inode(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700716 return;
717 }
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700718 nilfs_transaction_begin(sb, &ti, 0); /* never fails */
719
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700720 if (inode->i_data.nrpages)
721 truncate_inode_pages(&inode->i_data, 0);
722
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900723 /* TODO: some of the following operations may fail. */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700724 nilfs_truncate_bmap(ii, 0);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900725 nilfs_mark_inode_dirty(inode);
Al Viro6fd1e5c2010-06-07 11:55:00 -0400726 end_writeback(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900727
728 nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900729 atomic_dec(&ii->i_root->inodes_count);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900730
Al Viro6fd1e5c2010-06-07 11:55:00 -0400731 nilfs_clear_inode(inode);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900732
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700733 if (IS_SYNC(inode))
734 nilfs_set_transaction_flag(NILFS_TI_SYNC);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700735 nilfs_transaction_commit(sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700736 /* May construct a logical segment and may fail in sync mode.
737 But delete_inode has no return value. */
738}
739
740int nilfs_setattr(struct dentry *dentry, struct iattr *iattr)
741{
742 struct nilfs_transaction_info ti;
743 struct inode *inode = dentry->d_inode;
744 struct super_block *sb = inode->i_sb;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700745 int err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700746
747 err = inode_change_ok(inode, iattr);
748 if (err)
749 return err;
750
751 err = nilfs_transaction_begin(sb, &ti, 0);
752 if (unlikely(err))
753 return err;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700754
Christoph Hellwig10257742010-06-04 11:30:02 +0200755 if ((iattr->ia_valid & ATTR_SIZE) &&
756 iattr->ia_size != i_size_read(inode)) {
757 err = vmtruncate(inode, iattr->ia_size);
758 if (unlikely(err))
759 goto out_err;
760 }
761
762 setattr_copy(inode, iattr);
763 mark_inode_dirty(inode);
764
765 if (iattr->ia_valid & ATTR_MODE) {
766 err = nilfs_acl_chmod(inode);
767 if (unlikely(err))
768 goto out_err;
769 }
770
771 return nilfs_transaction_commit(sb);
772
773out_err:
774 nilfs_transaction_abort(sb);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700775 return err;
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700776}
777
Nick Pigginb74c79e2011-01-07 17:49:58 +1100778int nilfs_permission(struct inode *inode, int mask, unsigned int flags)
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900779{
Nick Pigginb74c79e2011-01-07 17:49:58 +1100780 struct nilfs_root *root;
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900781
Nick Pigginb74c79e2011-01-07 17:49:58 +1100782 if (flags & IPERM_FLAG_RCU)
783 return -ECHILD;
784
785 root = NILFS_I(inode)->i_root;
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900786 if ((mask & MAY_WRITE) && root &&
787 root->cno != NILFS_CPTREE_CURRENT_CNO)
788 return -EROFS; /* snapshot is not writable */
789
Nick Pigginb74c79e2011-01-07 17:49:58 +1100790 return generic_permission(inode, mask, flags, NULL);
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900791}
792
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900793int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700794{
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900795 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700796 struct nilfs_inode_info *ii = NILFS_I(inode);
797 int err;
798
799 spin_lock(&sbi->s_inode_lock);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700800 if (ii->i_bh == NULL) {
801 spin_unlock(&sbi->s_inode_lock);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900802 err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
803 inode->i_ino, pbh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700804 if (unlikely(err))
805 return err;
806 spin_lock(&sbi->s_inode_lock);
807 if (ii->i_bh == NULL)
808 ii->i_bh = *pbh;
809 else {
810 brelse(*pbh);
811 *pbh = ii->i_bh;
812 }
813 } else
814 *pbh = ii->i_bh;
815
816 get_bh(*pbh);
817 spin_unlock(&sbi->s_inode_lock);
818 return 0;
819}
820
821int nilfs_inode_dirty(struct inode *inode)
822{
823 struct nilfs_inode_info *ii = NILFS_I(inode);
824 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
825 int ret = 0;
826
827 if (!list_empty(&ii->i_dirty)) {
828 spin_lock(&sbi->s_inode_lock);
829 ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
830 test_bit(NILFS_I_BUSY, &ii->i_state);
831 spin_unlock(&sbi->s_inode_lock);
832 }
833 return ret;
834}
835
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900836int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700837{
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900838 struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700839 struct nilfs_inode_info *ii = NILFS_I(inode);
840
841 atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks);
842
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700843 if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700844 return 0;
845
846 spin_lock(&sbi->s_inode_lock);
847 if (!test_bit(NILFS_I_QUEUED, &ii->i_state) &&
848 !test_bit(NILFS_I_BUSY, &ii->i_state)) {
849 /* Because this routine may race with nilfs_dispose_list(),
850 we have to check NILFS_I_QUEUED here, too. */
851 if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) {
852 /* This will happen when somebody is freeing
853 this inode. */
854 nilfs_warning(sbi->s_super, __func__,
855 "cannot get inode (ino=%lu)\n",
856 inode->i_ino);
857 spin_unlock(&sbi->s_inode_lock);
858 return -EINVAL; /* NILFS_I_DIRTY may remain for
859 freeing inode */
860 }
861 list_del(&ii->i_dirty);
862 list_add_tail(&ii->i_dirty, &sbi->s_dirty_files);
863 set_bit(NILFS_I_QUEUED, &ii->i_state);
864 }
865 spin_unlock(&sbi->s_inode_lock);
866 return 0;
867}
868
869int nilfs_mark_inode_dirty(struct inode *inode)
870{
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700871 struct buffer_head *ibh;
872 int err;
873
Ryusuke Konishibcbc8c62010-12-27 00:05:49 +0900874 err = nilfs_load_inode_block(inode, &ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700875 if (unlikely(err)) {
876 nilfs_warning(inode->i_sb, __func__,
877 "failed to reget inode block.\n");
878 return err;
879 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700880 nilfs_update_inode(inode, ibh);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700881 nilfs_mdt_mark_buffer_dirty(ibh);
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900882 nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700883 brelse(ibh);
884 return 0;
885}
886
887/**
888 * nilfs_dirty_inode - reflect changes on given inode to an inode block.
889 * @inode: inode of the file to be registered.
890 *
891 * nilfs_dirty_inode() loads a inode block containing the specified
892 * @inode and copies data from a nilfs_inode to a corresponding inode
893 * entry in the inode block. This operation is excluded from the segment
894 * construction. This function can be called both as a single operation
895 * and as a part of indivisible file operations.
896 */
897void nilfs_dirty_inode(struct inode *inode)
898{
899 struct nilfs_transaction_info ti;
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900900 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700901
902 if (is_bad_inode(inode)) {
903 nilfs_warning(inode->i_sb, __func__,
904 "tried to mark bad_inode dirty. ignored.\n");
905 dump_stack();
906 return;
907 }
Ryusuke Konishi7d6cd922010-08-21 00:30:39 +0900908 if (mdi) {
909 nilfs_mdt_mark_dirty(inode);
910 return;
911 }
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700912 nilfs_transaction_begin(inode->i_sb, &ti, 0);
Ryusuke Konishi458c5b02009-04-06 19:01:56 -0700913 nilfs_mark_inode_dirty(inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700914 nilfs_transaction_commit(inode->i_sb); /* never fails */
Ryusuke Konishi05fe58f2009-04-06 19:01:32 -0700915}
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900916
917int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
918 __u64 start, __u64 len)
919{
920 struct the_nilfs *nilfs = NILFS_I_NILFS(inode);
921 __u64 logical = 0, phys = 0, size = 0;
922 __u32 flags = 0;
923 loff_t isize;
924 sector_t blkoff, end_blkoff;
925 sector_t delalloc_blkoff;
926 unsigned long delalloc_blklen;
927 unsigned int blkbits = inode->i_blkbits;
928 int ret, n;
929
930 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
931 if (ret)
932 return ret;
933
934 mutex_lock(&inode->i_mutex);
935
936 isize = i_size_read(inode);
937
938 blkoff = start >> blkbits;
939 end_blkoff = (start + len - 1) >> blkbits;
940
941 delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
942 &delalloc_blkoff);
943
944 do {
945 __u64 blkphy;
946 unsigned int maxblocks;
947
948 if (delalloc_blklen && blkoff == delalloc_blkoff) {
949 if (size) {
950 /* End of the current extent */
951 ret = fiemap_fill_next_extent(
952 fieinfo, logical, phys, size, flags);
953 if (ret)
954 break;
955 }
956 if (blkoff > end_blkoff)
957 break;
958
959 flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
960 logical = blkoff << blkbits;
961 phys = 0;
962 size = delalloc_blklen << blkbits;
963
964 blkoff = delalloc_blkoff + delalloc_blklen;
965 delalloc_blklen = nilfs_find_uncommitted_extent(
966 inode, blkoff, &delalloc_blkoff);
967 continue;
968 }
969
970 /*
971 * Limit the number of blocks that we look up so as
972 * not to get into the next delayed allocation extent.
973 */
974 maxblocks = INT_MAX;
975 if (delalloc_blklen)
976 maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
977 maxblocks);
978 blkphy = 0;
979
980 down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
981 n = nilfs_bmap_lookup_contig(
982 NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
983 up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
984
985 if (n < 0) {
986 int past_eof;
987
988 if (unlikely(n != -ENOENT))
989 break; /* error */
990
991 /* HOLE */
992 blkoff++;
993 past_eof = ((blkoff << blkbits) >= isize);
994
995 if (size) {
996 /* End of the current extent */
997
998 if (past_eof)
999 flags |= FIEMAP_EXTENT_LAST;
1000
1001 ret = fiemap_fill_next_extent(
1002 fieinfo, logical, phys, size, flags);
1003 if (ret)
1004 break;
1005 size = 0;
1006 }
1007 if (blkoff > end_blkoff || past_eof)
1008 break;
1009 } else {
1010 if (size) {
1011 if (phys && blkphy << blkbits == phys + size) {
1012 /* The current extent goes on */
1013 size += n << blkbits;
1014 } else {
1015 /* Terminate the current extent */
1016 ret = fiemap_fill_next_extent(
1017 fieinfo, logical, phys, size,
1018 flags);
1019 if (ret || blkoff > end_blkoff)
1020 break;
1021
1022 /* Start another extent */
1023 flags = FIEMAP_EXTENT_MERGED;
1024 logical = blkoff << blkbits;
1025 phys = blkphy << blkbits;
1026 size = n << blkbits;
1027 }
1028 } else {
1029 /* Start a new extent */
1030 flags = FIEMAP_EXTENT_MERGED;
1031 logical = blkoff << blkbits;
1032 phys = blkphy << blkbits;
1033 size = n << blkbits;
1034 }
1035 blkoff += n;
1036 }
1037 cond_resched();
1038 } while (true);
1039
1040 /* If ret is 1 then we just hit the end of the extent array */
1041 if (ret == 1)
1042 ret = 0;
1043
1044 mutex_unlock(&inode->i_mutex);
1045 return ret;
1046}